I think the point would be: what if instead of using a whole core and it takes 2000ms to load because it is essentially "spinning its wheels" it would only use

I think the point would be: what if instead of using a whole core and it takes 2000ms to load because it is essentially "spinning its wheels" it would only use half a core and it takes 50ms? 2s you notice as a user. 50ms you won't. In fact even 500ms you won't notice too much but we are getting close to where optimization will be noticeable to a user.